2018A&A...612A.102T


Query : 2018A&A...612A.102T

2018A&A...612A.102T - Astronomy and Astrophysics, volume 612A, 102-102 (2018/4-1)

An X-ray survey of the central molecular zone: Variability of the Fe Kα emission line.

TERRIER R., CLAVEL M., SOLDI S., GOLDWURM A., PONTI G., MORRIS M.R. and CHUARD D.

Abstract (from CDS):

There is now abundant evidence that the luminosity of the Galactic super-massive black hole (SMBH) has not always been as low as it is nowadays. The observation of varying non-thermal diffuse X-ray emission in molecular complexes in the central 300pc has been interpreted as delayed reflection of a past illumination by bright outbursts of the SMBH. The observation of different variability timescales of the reflected emission in the Sgr A molecular complex can be well explained if the X-ray emission of at least two distinct and relatively short events (i.e. about 10yr or less) is currently propagating through the region. The number of such events or the presence of a long-duration illumination are open questions. Variability of the reflected emission all over of the central 300pc, in particular in the 6.4keV Fe Kα line, can bring strong constraints. To do so we performed a deep scan of the inner 300pc with XMM-Newton in 2012. Together with all the archive data taken over the course of the mission, and in particular a similar albeit more shallow scan performed in 2000-2001, this allows for a detailed study of variability of the 6.4keV line emission in the region, which we present here. We show that the overall 6.4keV emission does not strongly vary on average, but variations are very pronounced on smaller scales. In particular, most regions showing bright reflection emission in 2000-2001 significantly decrease by 2012. We discuss those regions and present newly illuminated features. The absence of bright steady emission argues against the presence of an echo from an event of multi-centennial duration and most, if not all, of the emission can likely be explained by a limited number of relatively short (i.e. up to 10yr) events.

Abstract Copyright: © ESO 2018

Journal keyword(s): Galaxy: center - X-rays: general

CDS comments: Table A.2 : Br1, Br2 not in SIMBAD. Some regions not identified.

Simbad objects: 28

goto Full paper

goto View the references in ADS

Number of rows : 28
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Magellanic Stream HVC 00 32 -30.0           ~ 881 1
2 NAME Great Annihilator LXB 17 43 54.83 -29 44 42.6           ~ 653 1
3 3FHL J1746.2-2852 LXB 17 44 33.09 -28 44 27.0           ~ 511 0
4 2XMM J174445.4-295046 XB* 17 44 45.55 -29 50 44.3           ~ 15 0
5 2XMM J174502.1-285450 LXB 17 45 02.33 -28 54 49.7           ~ 125 0
6 XMMU J174505.3-291445 X 17 45 05.3 -29 14 45           ~ 1 0
7 NAME Fermi Bubbles bub 17 45 -29.0           ~ 344 0
8 [SKM2002] 27 LXB 17 45 35.65 -29 01 34.0           ~ 170 1
9 CXOGC J174537.9-290025 X 17 45 37.98 -29 00 25.2           ~ 3 0
10 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 12913 0
11 NAME Arched Filaments PoC 17 45 46.9 -28 50 39           ~ 50 1
12 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 685 0
13 [CWP2012b] A X 17 45 52.398 -28 56 38.15           ~ 14 0
14 CXOGC J174554.3-285454 smm 17 45 54.46 -28 54 55.0           ~ 17 1
15 [CWP2012b] B1 X 17 45 59.592 -28 57 10.09           ~ 13 0
16 GAL 000.11-00.11 MoC 17 46 18 -28 54.0           ~ 61 0
17 2E 3944 LXB 17 46 21.09 -28 43 42.3     12.50     ~ 112 0
18 XMMU J174654.1-291542 X 17 46 54.15 -29 15 42.6           ~ 7 0
19 [KRL2007b] 275 LXB 17 47 02.60 -28 52 58.9     14.20     ~ 166 0
20 GCM +0.51 -0.10 X 17 47 06 -28 33.2           ~ 5 0
21 NAME Sgr B2 HII A HII 17 47 19.502 -28 22 59.92           ~ 9 0
22 NAME Sgr B2 HII B HII 17 47 19.900 -28 23 03.00           ~ 18 0
23 NAME Sgr B2 HII C HII 17 47 20.020 -28 23 18.28           ~ 13 0
24 NAME Sgr B2 HII D HII 17 47 20.054 -28 23 12.81           ~ 15 0
25 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2092 1
26 GAL 000.66-00.13 ? 17 47 41.50 -28 26 23.0           ~ 8 0
27 GAL 000.76-00.09 MoC 17 48 01.5 -28 21 00           ~ 7 1
28 [CHM2006] Candidate 1b LXB 17 49 38.039 -28 21 17.50           ~ 71 0

To bookmark this query, right click on this link: simbad:objects in 2018A&A...612A.102T and select 'bookmark this link' or equivalent in the popup menu


2022.05.26-01:59:02

© Université de Strasbourg/CNRS

    • Contact